Electrical checking device



June 4, 1957 R. T. HALL ELECTRICAL CHECKING DEVICE 2 Sheets-Sheet 1 Original Filed June 19, 1950 INVENTOR.

ROBERT T. HALL ATTORNEYS June 4, 1957 R. T. HALL ELECTRICAL CHECKING DEVICE 2 Sheets-Sheet 2 Original Filed June 19, 1950 FIG.6.

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INVENTOR.

ROBERT T. HA LL ATTORNEYS United States Patent ELECTRICAL CHECKING DEVICE Robert T. Hall, Birmingham, Mich., assignor to Kelsey- Hayes Company, a corporation of Delaware Original application June 19, 1950, Serial No. 168,930, now Patent No. 2,687,454, dated August 24, 1954. Divided and this application June 1, 1954, Serial No. 433,451

7 Claims. (Cl. 20061.41)

The invention relates to electrical devices for checking dimensional variations of articles and refers more particularly to electrical devices for checking dimensional variations or run-outs of rotatable articles.

The invention has for one of its objects to provide an improved device for checking dimensional variations of individual articles which device is so constructed that it is eflicient in operation and may be economically manufactured.

The invention has for another object to provide a checking device which is automatically operable upon dimensional variation greater than that allowed in commercial practice.

The invention has for a further object to provide a checking device having an electrical contact mounted on a slide which is adapted to be positioned by the article being checked to position the contact so that no electric circuit is made or completed through the contact if the dimensional variation of the article is within commercial limits but an electric circuit is made through the contact if the dimensional variation is greater.

With these and other objects in view, the invention resides in the novel features of construction and combinations and arrangements of parts as more fully hereinafter set forth.

In the drawings:

Figure 1 is a top plan view of a device embodying the invention;

Figure 2 is a side elevation of the device applied to an article which is shown in section;

Figure 3 is a side elevation of the device lookingtowards the left in Figure 2;

Figure 4 is a view similar to Figure 2 showing the device applied to the same article for checking a different dimensional variation;

Figure 5 is a view similar to Figure 2 showing a modified construction of device;

Figure 6 is a front elevation thereof;

Figure 7 is a view similar to Figure 6 showing another modified construction of device.

While the device may be used to check dimensional variations in a large number of articles, such as, disks, hubs, brake drums, rims, blocks, plates and the like, the device as illustrated in Figures 1, 2 and 3 is used to check the lateral dimensional variation or run-out of a rotatable article such as a tire carrying rim.

The device comprises the electrical conducting support 1 formed of the generally L-shaped plate 2 and the channel-shaped plate 3 secured to the short arm of the plate 2. The device also comprises the channel-shaped slide 4 which is formed of insulating material and has the flanges 5 and 6 provided with apertures for slidably engaging the rod 7 which extends transversely of and is secured to the end flanges 8 of the channel-shaped plate.

2 ,794,878 Patented June 4, 1957 ICC 9 is an adjustable electrical contact extending transversely of and threadedly engaging the flange 6 of the slide and 10 is a second electrical contact movable between the contact 9 and the flange 5 of the slide. The contact it) forms part of the arm 11 of the bell crank 12 which is pivotally and electrically connected by the pin 13 to the lateral projection 14 at the free end of the long arm of the plate 2. The other arm 15 of the bell crank has journalled thereon the roll 16 which is engageable with the carrying rim 17 and more particularly the axially outer surface of the tire retaining flange 18 of the rim.

For normally urging the bell crank to swing in a clockwise direction and move the contact 10 toward the contact 9 there is the coil spring 19 between the arm 11 of the bell crank and the projection 20 extending transversely of the free end of the short arm of the plate 2.

The rim is mounted on the wheel body or spider 21 which in turn is mounted on and secured to the rotatable spindle 22. The support 1 with the parts carried thereby is movable toward the rim and spider to engage the roll 16 with the tire retaining flange 18 of the rim at which time the arm 11 of the multiplier bell crank, and more particularly, the contact 10 engages the flange 5 of the slide and moves the slide along the rod 7 and the plate 3 to a position dependent upon the highest point of the axially outer surface of the tire retaining flange engaged by the roll. The contact 9 is adjusted so that its contact face is spaced from the opposed face of the flange 6 a predetermined distance such that during the rotation of the rim, the contact 10 will not engage the contact 9 if the lateral run-out of the rim is within commercial limits but the two contacts will be engaged if the lateral run-out is greater.

For the purpose of holding the slide 4 in the position to which it is adjusted by the bell crank 12, I have provided the device 23 which in the present instance is a permanent magnet mounted in the base of the slide 4 and slidable over the base of the plate 3.

The contact 9 and support 1 are connected to a suitable source of electric power by the lines 24 and 25 respectively, the line 24 having the relay 26 of the lockdown type which, when the electric circuit is made or completed by reason of the contact 10 engaging the contact 9, controls operation of suitable mechanism such as a light, bell or a reject device (not shown) or a combination thereof.

As illustrated in Figure 4, the device is used to check the radial dimensional variation or run-out of the the carrying rim and more particularly one of the tire bead seats 27 of the rim during its rotation. It will be noted that the construction of the device is the same as that of Figures 1, 2 and 3 but it is mounted at right angles so that it is quite important to provide means such as the permanent magnet for holding the slide in the position to which it is adjusted by the multiplier bell crank since the slide might otherwise drop to its inoperative position.

In operation when either device is brought into operative relation to the article to be checked, and more particularly the tire carrying rim, the roll of the device engages the article and through the multiplier bell crank automatically adjusts the slide relative to the support to a position determined by the highest point of the surface of the article upon its rotation. Since the adjustable electrical contact is set to allow a predetermined variation in distance from the highest point to the lowest point of the surface of the article being checked, the device will make or complete the electric signaling circuit if the dimensional variation or run-out is in excess. However,

electric circuit.

if the variation is within the commercial limits allowed the device will not operate to make or close the electric circuit.

The device illustrated in Figures 5 and 6 differs essentially from the device of Figures 1, 2 and 3 in having a direct acting plunger for making and breaking the More particularly the device comprises the electrical conducting channel-shaped plate 28 forming the support, the insulator channel-shaped slide 29 having its base slidable over the base of the plate and its flanges 30 and 31 slidable over the rods 32 which extend between and are mounted on the end flanges of the plate. 33 is the adjustable electrical contact extending trans versely of and threadedly engaging the flange 3t and 34 is the cooperating contact mounted on and forming part .of the head 35 of the plunger 36 which slidably extends through the flange 30 and has a rounded end engageable with the surface of the work to be checked. 37 is a coil spring extending through a hole in the flange 31 of the slide and abutting the head 35 and the adjacent end flange of the plate 28 and forming an electrical connection between the end flange and the head. The end flange and the adjustable electrical contact are connected by suitable electric lines to the source of power and the signaling mechanism.

' The device illustrated in Figure 7 is in general the same as that illustrated in Figures 5 and 6 with the exception that both electrical contacts are carried by the slide. In detail, the flange 38 of the channel-shaped slide 39 adjustably carries the transversely extending tube 4% which is preferably formed of insulating material. This tube carries the electrical contact 41 and also the electrical contact 42 which latter extends over and is normally spaced above the contact 41 and is in position to be engaged by the head 43 of the work engaging plunger 44. The electrical contacts are directly connected to the source of electrical power by electric lines including the signaling mechanism. The tube 40 is adjustably mounted.

In operation, it will be seen that in the devices of Figures 5 and 6 and Figure 7, the plungers automatically adjust the slides to predetermined positions relative to their supports dependent upon the highest points of the surfaces of the articles being checked and control the making or closing of the electric circuits in the event that the lowest points of the surfaces of the articles being checked are spaced in excess of the predetermined amount.

It will be noted that all of the above devices are operative to check dimensional variations of individual articles without particular reference to each other since the slides are adjustable through a considerable range. Therefore, the articles being checked need not have the same basic dimensions.

The present application is a division of my co-pending application Serial No. 168,930 filed June 19, 1950, now Patent No. 2,687,454, dated August 24, 1954.

What I claim as my invention is:

1. An electrical device for checking dimensional variation of an article comprising a support, a member movable relative to said support, said member having spaced parts, a contact carried by one of said spaced parts, a second contact movable into engagement with said first mentioned contact, a plunger engageable with the article and extending through said spaced part carrying said first mentioned contact and having a part for effecting the adjustment of said member relative to said support through the other of said spaced parts and for holding said second contact out of engagement with said first mentioned contact, a magnet for normally holding said member in adjusted position, and spring means for urging said plunger toward the article and efiecting movement of said second contact toward said first mentioned contact.

2. An electrical device for checking dimensional variation of an article comprising a support, a member movable 4 relative to said support, said member having spaced parts, a second member movable relative to said support and first mentioned member, a contact carried by one of said spaced parts, a second contact carried by said second mentioned member and movable into engagement with said first mentioned contact, a plunger engageable with the article and extending through said spaced part carrying said first mentioned contact and operatively connected to said second member, said plunger upon movement in one direction being adapted to effect adjustment of said first mentioned member relative to said support through said second mentioned member, a magnet for holding said first mentioned member in adjusted position upon said support, and spring means between one of said first mentioned parts and said second member for urging said plunger toward the article and moving said second contact toward said first mentioned contact.

3. An electrical device for checking dimensional varia tion of an article comprising a support, a member movable relative to said support, said member having spaced parts, a contact carried by one of said spaced parts, a second contact movable into engagement with said first mentioned contact, a plunger engageable with the article and having a part for efiecting the adjustment of said member relative to said support through the other of said spaced parts and for holding said second contact out of engagement with said first mentioned contact, means for normally holding said member in adjusted position, and spring means for urging said plunger toward the article and effecting movement of said second contact toward said first mentioned contact.

4. An electrical device for checking dimensional variation of an article comprising a support, a member movable relative to said support, a contact carried by said member, a second contact, a second member engageable with the article and supported for movement in opposite directions, said second member being movable in one direction by the article and operative upon movement in said one direction to adjustably position said first-mentioned member, said second member being operative upon movement in the opposite direction to move said second contact into engagement with said first mentioned contact, and spring means for urging said second member in said opposite direction to engage said contacts.

5. An electrical device for checking dimensional variation of an article comprising a suport, a channel-shaped member movable relative to said support, an electrical contact on a flange of said member, a reciprocable plunger engageable with the article and extending through the last metioned flange and having a head engageable with the other flange of said member upon movement of said plunger in one direction to adjustably position said member relative to said support, a second electrical contact on said head, and a spring for urging said plunger in the opposite direction to engage said contacts.

6. An electrical device for checking dimensional variation of an article comprising a support, a channel-shaped member movable relative to said support, an electrical contact on a flange of said member, a reciprocable plunger engageable with the article and extending through said flange and having a head engageable with the other flange of said member upon movement of said plunger in one direction to adjustably position said member relative to said support, a second electrical contact on the first mentioned flange, and a spring for urging said plunger in the opposite direction to move said head against said second contact and thereby move the latter against said first mentioned contact.

7. An electrical device for checking dimensional variation of an article comprising a support, a member movable relative to said support, a contact carried by said member, a second contact, a reciprocable plunger engageable with the article and supported for movement in opposite directions, said plunger being movable in one direction by the article and operative upon movement 5 R in said one direction to adjustably position said memher, said plunger being operative upon movement in the opposite direction to move said second contact into engagement With said first mentioned contact, a spring for urging said plunger in said opposite direction to en- 5 gage said contacts, and means for normally holding said member in adjusted position.

References Cited in the file of this patent UNITED STATES PATENTS Brown Mar. 19, 1907 Foster Dec. 23, 1941 Martin May 26, 1942 Schaurte Jan. 26, 1954 

